That's not "lately", it has always been te case. Just look at the log: May, June, July and September all had strings of builds. It takes a few builds to get to a stable beta build.
The dev build before the current string, 3125, was a beta build (released as 3126) so obviously the latest builds are less stable than that. The dev builds are not safe, you should be using the beta builds if you don't understand or want to deal with this.